Why do you think americans were not interested in acquiring new lands after the civil war

Maybe it is possible that they did not want to start another war

E
operation vittles - american airlift operating during the blockade of berlin from 26 june 1948 to 30 september 1949; it is at the same time the british airlift operation was called plainfare. as part of operation vittles 189 963 flights was made,while transporting 1 783 573 tons of supplies. the operation was attended by about 75,000 civilians and soldiers.  31 airmen were killed during operation, and the cost of american operations amounted to over $ 137 million (approx. $ 1.49 billion in 2015).