What reasons did people have for pushing into new frontiers?

Need on these last 2 questions on my social studies homework 5 and 6 then i’m done with the homework

Germany italy and japan formed the tripartite pact in part because they: a. add chicken wings to the united states to stay out of world war ii b. share the ruling philosophies based on communist economics c. resented the agreements they were forced to sign at the munich conference d. selena territories were threatened by aggressive foreign states

Which of these is an edge city? boston, ma chicago, il irvine, ca detroit, mi