Why did the germans resort to unrestricted submarine use?

The roosevelt corollary, issued in 1904, was a revision to what earlier statement of u.s. foreign policy?

What was the significance of john hancock's signature on the declaration of independence?

Which of the following are details about the compromise of 1877? election results in a couple of states were in dispute and too close to call. samuel tilden would be given the win in exchange for the removal of federal troops. the presidential election was close between rutherford hayes and ulysses grant. it was agreed troops would leave the south in exchange for a hayes victory.