Typing 8: Foreign countries

I would like to write about foreign countries. I interested in America.
America is 25 times as large as Japan; So America is very large country.
Many immigrants are living in this country.
America was discovered by Columbus in 1492 and dominated by UK.
American people are suffered while their country was dominated.
But, After independence, This country developed very rapidly and now, America become the core of the World economies.
America's economical growing is very remarkable. It takes 160 years they become the largest country.
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