Question

1. how did the u.s. enter formally world war i?

by forming an alliance with italy
by invading the ottoman empire
by moving to occupy austria - hungary
by declaring war on germany

Explanation:

To determine how the U.S. formally entered World War I, we analyze each option:

• "by forming an alliance with Italy": The U.S. didn't enter WWI by allying with Italy. Italy was part of the Triple Alliance initially but switched sides, and the U.S. had a different path to entry.
• "by invading the Ottoman Empire": The U.S. did not invade the Ottoman Empire as a means of entering WWI. The Ottoman Empire was a Central Power, but U.S. entry was not via this action.
• "by moving to occupy Austria - Hungary": The U.S. did not enter WWI by attempting to occupy Austria - Hungary. Austria - Hungary was a Central Power, and U.S. involvement came about due to other factors.
• "by declaring war on Germany": In 1917, after events like the Zimmermann Telegram and unrestricted submarine warfare by Germany, the U.S. declared war on Germany, which was the formal way it entered World War I.

Answer:

D. by declaring war on Germany