The planet would be warming at nearly the same rate regardless of what the US does... this is a global problem. We are only 11% of current emissions. One reason is that the Earth is still recovering from the LIA so there is natural warming built in and secondly the rest of the world contributes way more than we do.
Global temperature trend is more exponential than people think, because we've seen mostly La Nina's since 1998 vs a more average 33-33-33.
Per RONI, 5 of the last 6 years (20-26) have been La Nina. Per RONI, 7 of the last 10 years (16-26) have been La Nina. Per RONI, 11 of the last 19 years (07-26) have been La Nina. Per RONI, 15 of the last 28 years (98-26) have been La Nina. That's >50% La Nina since 1998.