I really need this please

What principle did president truman invoke in sending u.s. troops into south korea without first asking congress to declare war?

During the invasion of the soviet union, the einsatzgruppen did which of the following? killed large numbers of jews, as well as many locals. led military troops. eliminated local administration in lithuania. took over many administrative functions in the war effort. planned and organized extermination camps.

What was gained through the gadsden purchase