How did German tactics change to involve the United States in World War I?

Select all that apply.

a. sinking of ships that carried civilians

b. sinking of allied ships

c. using propaganda in other countries

d. unrestircted submarine warfare

e. announcing they wanted total war

A. B. D.

Explanation:

The major reasons why the U.S was involved was because german unrestricted submarine warfare destroyed allied ships carrying american passengers.

studies show tha in 7.5 billion years from now, the expanding sun will engulf, and destroy, the earth.

the graph shows the spread of railways in the 1800s.

based on the graph, the conclusion that can be drawn about germany is answer d)   by 1880, germany had more rail lines than great britain and russia.