What historical event directly led to the end of available frontier lands for settlement?

a) homestead act of 1862
b) 1849 gold rush
c) oklahoma land rush
d) railroad act of 1862

What happened as a result of the colonial victory at saratoga

What were the sites of three major battles the french army fought between 1805 and 1809?

Which puritan belief does this quote reflect? "the eyes of all people are upon us. so that if we shall deal falsely with our god in this work we have we shall be made a story and a by-word throughout the world."