What does "alaska is nothing but seward's icebox" mean

What new concept did the the american revolution introduce into the world

This map is depicting the 16th century route of what explorer? a) hernando de soto b) james oglethorpe c) sir walter raleigh d) juan ponce de leon

If the imperial dynasty had continued to rule china, it is most likely that a) the economy would have improved rather than weakened b) european nations would have gotten more of a foothold in china c) revolutionary groups would not have gained any power in the country d) communism would not have received support among the poor