Why were people able to develop leisure-time activities apex?

The correct answer is that People worked shorter days and fewer hours

Leisure time activities started developing when the amount of working hours was reduced and people had a lot of spare time. Nowadays there's not as much time for leisure activities as there was for example in the 1920s. This of course refers to middle class since low paid jobs always had workers exploited for as much as 12 hours a day.

From mexican american war , us gained new mexico.