What is the main purpose for the submarine warfare in ww2?

What does the document of the birtish octopus is an uderlying cause of the world war 1

What is one economic change related to smartphones? the use of electronic paythe use of tellers in banksa decrease in automationan increase in automation

Why did the treaty of paris strain the american alliance with the french? 1.the french had expected to control the negotiations. 2.the french were upset with the generous boundaries granted to the united states. 3.the french lost many of their colonies in the negotiations. 4. the french had supported the british throughout the war.