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In this lesson, you will learn about California’s population growth over time, including how it is calculated, and some factors that affect population growth rate.

The Most Populous State

Think about your home state. What is it known for? Every state has aspects that make it unique, and one of California’s claims to fame is its population size.

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Its current estimated population is 39,497,345, and as of the last official census in 2010, it was declared the most populous state. In fact, CA population is large even by world standards–there are only 34 countries that have a larger overall population than this single state!Even with such a huge population, a steady growth rate is necessary to keep the state economically balanced, such as in the housing and job markets. In order for the state to predict and provide for the needs of its future citizens, constant information about changes in the growth rate and overall population statistics is absolutely vital.This information is also necessary to keep track of environmental impacts. After all, a larger population requires more land area, and has the potential for greater environmental strain as more resources are needed. Nearby ecosystems can suffer severe negative impacts, especially if the need for habitable land is considered more important than ecosystem preservation.

How Do They Do It?

So how exactly is population growth rate determined? At the most basic level, it has to do with the birth and death rates of a state.

Annual birth rate is determined by taking the number of births in a year and dividing it by the total state population for that year. That equation would look like this:Number of births in a year/total population=Annual birth rate (ABR)Annual death rate is calculated exactly the same way:Number of deaths per year/total population=Annual death rate (ADR)The population growth rate is then determined by subtracting the annual death rate from the annual birth rate:ABR-ADR=Annual population growth rate

Other Factors

Of course, birth and death rates are not the only factors when looking at population of a state. Another factor is immigration, or the number of people moving into a state, rather than being born there. Over the last 25 years, immigration has made up an average of 58% of California’s population growth.

One other factor is emigration, or the number of people moving out of a state. Economics tend to be the strongest motivation for this. For example, California’s population growth rate decreased drastically in the early-mid 1990s as a result of the recession. There were fewer jobs available within the state, and so a higher percentage of people emigrated to find work.

CA Growth Rate Over Time

Although the actual rate has varied widely over the years, California has never seen a 10-year period (the amount of time between censuses) without growth.

On the whole, it has a very healthy rate of population growth, though a decrease in recent years means that the aging population of the state is greater than the younger population.

The population growth in San Francisco over time reflects the state population growth as a whole
San Francisco Population Growth

1850-1860

California’s highest growth rates were during the mid 1800s, when they reached over 15%. This is an excellent example of how immigration can be a major factor in population growth. The majority of the population increase during this time was a result of the gold rush, bringing in thousands of immigrants trying to make their fortune.

1870-1970

The next century of California’s history was less dramatic, as far as population growth rate is concerned.

The rate of increase slowed and became more steady. This is a huge period of time, so of course there was some variation, but nothing like the previous decade. The rate varied between 5% and 2%, with most decades averaging around 4%. With the gold rush past, the growth rate was determined more by birth and death rates, though of course immigration was a still a major factor.

1980-1990

1980-1990 was the last decade of higher-than-US-average population growth rate for California.

It peaked here at 2.5-3.5%, and has never been as high since.

This was caused mostly by the Baby Boomer generation. Many immigrated to California, and the birth rate spiked as they began settling in the area and starting families.

1990-Today

By now the growth rate has steadied to a certain degree.

As a result of the 1990s recession, it dropped down below 1%. Since then it has come back up slightly, and seems to have settled around 1% as of 2000. It is predicted to remain about this rate for the near future.

1% is a healthy growth rate for the population. It helps keep the state’s economics stable, and does not place the stress on the environment that a higher growth rate would.

Lesson Summary

California is the most populous state. In order to provide for future citizens, and to predict and hopefully prevent undue environmental stress, it is important to keep track of the population growth rate. This rate is calculated in part by subtracting the annual death rate from the annual birth rate. There are other factors as well, including immigration into the state, and emigration out of it. Economics tend to be the most likely reason for both emigration and immigration, which is one reason the growth rate often changes most during periods of economic uncertainty.

California’s highest growth rate was during the mid 1800s, as a result of the gold rush. It remained steady around 4% (with some variation) from 1870-1970. Following the increased rate caused by the Baby Boomer generation, it has not risen above 2%, and currently remains steady around 1%. This is a healthy growth rate that keeps the economy stable without placing extreme stress on the environment as a higher rate would.

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