<span>Because Wilson found it increasingly difficult to maintain U.S. neutrality after Germany, despite its promises in the Arabic pledge and the Sussex pledge, initiated a program of unrestricted submarine warfare early in 1917 that threatened U.S. commercial shipping.
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alisa202</span>
The main reason the United States entered World War<span> I in 1917 was the unrestricted attacks German submarines were making on American ships and ships containing American passengers. Additionally, Americans were enraged at a telegram British intelligence intercepted in which Germany sought an alliance with Mexico.</span>
The control unit for an artificial heart was invented by Otis Frank Boykin.
A it forced the Japanese to call off their attack on New Guinea
Answer: Mountains (IF THIS IS AFRICA)
Explanation: . It is subdivided into a number of zones running north and south and consisting in turn of mountain ranges, tablelands and hollows. The most striking feature is the existence of two great lines of hollows, due largely to the subsidence of whole segments of the Earth's crust, the lowest parts of which are occupied by vast lakes. Towards the south the two lines converge and give place to one great valley (occupied by Lake Nyasa, or Lake Malawi), the southern part of which is less distinct due to rifting and subsidence than the rest of the system.