America is a nation of immigrants, and though the country has seen a lot of new arrivals over the past two centuries, the rate of immigration has been far from steady.

War, famine, economic boom and bust, religious persecution, and government intervention have all caused wild swings in the rate of immigration from countries around the world.

Today’s striking animation, by Max Galka, is a great way to see changes in immigration over time. Inflows from specific countries rise and fall, and the top three countries of origin change numerous times over the years.

Below, is another way to look at the ebb and flow of American immigration since the early 1800s.

Let’s look at the “waves” in more detail.

WAVE ONE: THE OLD IMMIGRATION

From 1820 to 1870, over 7.5 million immigrants made their way over to the United States, effectively doubling the young country’s population in only half a decade.

Ireland, which was in the throes of the Potato Famine, saw half its population set sail for the U.S. during that time. This wave of immigration can still be seen in today’s demographics. There are now more Irish-Americans than there are Irish nationals.

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