What gave president johnson the power to commit troops to vietnam without asking congress for a declaration of war?

The correct answer is The Gulf of Tonkin Resolution.

After the Gulf of Tonkin incident during the Vietnam War, Congress agreed to give the executive branch (aka the president) significantly more power in terms of committing troops to a war. In the Gulf of Tonkin Resolution, it was stated that the president could commit military forces to a certain area without Congressional approval. Before this time, the president would have to convince Congress to declare war on a nation before comitting troops.

hello,

i'm not so sure but i hope this in anyway.

the president of russia is head of state, and of a multi-party system with executive power exercised by the government, headed by the prime minister, who is appointed by the president with the parliament's approval.

hope this : )