A、In 1776. B、In 1894. C、In 1790. D、In 1863. DIn which year did president Lincoln free the slaves?

Where Did the Americans Come from? There is a great deal of land in the United States, but there is also a population in America. Where did the people come from?
    The first Americans who came to the land were Indians. Today there are about 900,000 American Indians. There is one part of the country with an especially large Indian population. That is the southwest. Blacks first came to America from Africa as slaves. President Lincoln freed the slaves in 1863. About eleven percent of the present American population are Blacks. The first immigrants in American history came from England and the Netherlands. Soon immigrants began to arrive from many other countries, and they are still arriving. In 1790 the new nation had fewer than four million people. Today there are more than 300 million. These include people from all parts of the world.