I need help on these to

Why was it difficult fpr unions to succeed in the 1800s

How did the results of wwi benefit the u.s.?

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