What events moved the united states from neutrality to war

In vernonia school district v. acton, the school district argued that a drug test was illegal under any circumstances. no student could refuse to take a drug test. drug tests were not given at random. drug testing was necessary to protect all students.

Why was russia drawn into a conflict with germany after ausria-hungary declared war on serbia ?

After the civil war which president was called a "carpetbagger"?