Why did the united states and many other nations step in to the first persian gulf war?

The United States stepped in because Saudi Arabia and Egypt grew concerned over the Iraqi invasion of Kuwait, they basically asked for help from the US and other Western nations.

Opposition to the nra came to a head in 1935, when the conservative supreme court declared the agency unconstitutional, claiming the nra gave the executive branch regulatory powers that belonged exclusively to congress. this decision began a series of court decisions that overturned key elements of the new deal.