Historical Game Crashing
 

I created a historical game starting in 1871 and the game consistently crashes anytime I try to simulate. I made it through the first season (although the game crashed at least 5 times) but have had even more problems in 1872. Following more game crashing I'm in July now but every time I reach July 27th the game crashes when I advance to the 28th. Are there any solutions to this issue? My game is fully updated and I'm running it on a MacBook Air.