If you love something truly, you won't have to consider it work. I love dogs, so if I watched dogs and I loved my job, I would not consider it work.
It works also like music. I play music for fun, and I now come to the reality that I can make money from this! So I can play music for fun and I don't think of it as work.
After the events that took place after 9/11, the U.S invaded Afghanistan. But I don't remember hearing about an "alliance" but they did have some what a alliance with United Kingdom and the Taliban. See if you look back at history they blamed Osama Bin Laden for the attack on 9/11 so there is no way they had an alliance especially since Osama was wanted in the FBI. In fact the president back then (George W Bush) demanded the Taliban to hand over Osama but the Taliban wanted proof that Osama's involvement in 9/11
There was never an alliance with Osama Bin Laden.
What that meant was that they were looking forward to saving the Union itself more than saving the African-Americans. There were slave states that had not yet seceded and insulting them might cause them to leave. This is why they said that they were protecting the constitution, they wanted to keep territorial integrity and sovereignty, more than they wanted to free the slaves.