A、One quarter of the whole American population. B、Eleven percent of the present American population. C、Around 90,000. D、Some 900

There is a great deal of land in the United States, but there are also a great many people. Where did the people come from?
   The first Americans were Indians. Today there are all 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 is black.
   The first immigrants in American history came from England and 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. Today, there are more than 210 million. These include people from all parts of the world.
15. What might be the best title for this passage?
16. How much is the American Indian population?
17. Who were the first people living in America?
18. What is the current size of the American population?