We already have alliances, that's why they hold a lot of our debt, we pretty much leave them alone about pollution, they haven't collected on their debt, we haven't pushed for sacking of their false economy, and we haven't taken McDonald's away from them.
Don't let that hacking garbage and the land grab in the Pacific Islands confuse you. Foreign politics are massively convoluted which is why Obama, and other presidents walk in the White House looking like they just graduated law school but four years later we're asking if they take advantage of the senior discount when they grab dinner at 3:00PM at Denny's. For those lost there, stereotype of old people is eating at Deny's, eating diner earlier every year, getting to bed before kickoff of the mid-day games.
Are we currently competing with any of our allies? And if so, is it any where as effective as competing with an adversary? Some of our greatest accomplishments as a nation occurred during our competition with the USSR. Fear of an enemy is one of those few things that can really bring a country together and help them do great things. United against a common enemy and all that. The greatest example of that that I can think of is a quote by one of the scientists from the Apollo program. He said, "The Apollo moon land was Communisms greatest achievement". It wouldn't just benefit us. China could also use an evil aggressor to unite their people behind. Simply put, were perfect for each other.