Executive Order No. 8802 was the result of the rampant discrimination of African-Americans and other minorities residing America at that time. It was the action of the federal government with regards to the issue by promoting equality in employment among the different defense agencies of the government.
Yes, more allies means you have more backup
Also, if you have a lot of allies, everybody can help each other in their time of need (for example, NATO) and the enemies will not be as aggressive in trying to attack you
hope this helps
You can actually research those question, it’s all about picking up your phone and typing it in :)