The first statement, "The Axis powers thought Britain was weak and America would not get involved in the war," is a correct analysis of one of the factors that contributed to the Axis powers' loss in World War II. The Axis, particularly Nazi Germany and Italy, underestimated the resilience of Britain and overestimated their own capabilities while also believing that the United States would remain uninvolved in the conflict for a longer period, which ultimately led to serious strategic miscalculations.
The other statements do not accurately capture the reasons for the Axis powers' defeat.