Why did having Soviet Union as an ally contradict one of the reasons for the United States involvement in the war?

As Allies, if one country were to attack your ally and your ally request your help to battle them your country must or it will break the promise and treaty they signed so they can be allies but Pearl Harbor was the best reason and main reason the U.S join the Allies in WW2

the french revolution main idea was to give power to the people. the revolution was influenced by the enlightenment ideas, reasoning and skepticism pushed people to revolt against standards and norms in french society.

the problem was that the revolution caused political turmoil, and napoleon saw this as an opportunity and launched a coup d’état in november 1799. he became the first consul of france and later named french emperor.

some people see napoleon as a hero of the revolution and others see him as a traitor.

people see him as a traitor because he noticed the political turmoil and used this moment to rise to power. others see him as a hero of the revolution because he had some political and military achievements - in which he was committed to promoting the achievements of the french revolution - he had extensive public constructions, made a civil reform.

in a bigger picture, napoleon had some huge achievements in france which made him very important, but the fact that he seized power to himself makes him an undeniable traitor to the revolution since the main idea of it was to remove people from power and give power to the people.