After its U-boats sank the Lusitania in 1915, what did Germany promise to do? O stop fighting on the western front
sign the Treaty of Brest-Litovsk
limit submarine warfare
sink more passenger vessels

Germany limited submarine warfare. The last choice.

Explanation:

America started to protest when Germany sunk the Lusitania. Germany apologized, and put restrictions on submarine warfare. They later sunk another ship, an Italian liner, without warning, killing over 270 people including Americans.

branches of government. to ensure a separation of powers, the u.s. federal government is made up of three branches: legislative, executive and judicial. the legislative branch is made up of the house and senate, known collectively as the congress.