2040s

The decade as a whole
This decade is expected to be called "the twenty-forties" or the "two thousand forties", and eventually just "the forties" (when the becomes obsolete). The number for 40 is XL.

The United States population is expected to reach 400 million

2045

 * One prediction (by ) places the emergence of the in 2045.
 * On, a will take place in the , producing a path that will go from  to .  Some parts of Florida are predicted to experience  for six minutes, the longest in US history.