Why were The German navy adopted unrestricted submarine warfare mainly?

The German navy adopted unrestricted submarine warfare primarily to counter the British naval blockade, which severely limited Germany's access to vital supplies and resources during World War I. By targeting merchant ships without warning, Germany aimed to disrupt Allied supply lines and weaken their war effort. This strategy was also intended to force Britain into submission by inflicting economic hardship. However, it ultimately led to significant diplomatic repercussions, including the United States entering the war against Germany.