The conference set the date for d-day, or operation overlord.

It was during the Tehran Conference that Stalin, FDR, and Churchill set the date and started the initial planning for D-Day, which was the first full invasion of Nazi-dominated Europe.

Industrialization changes society.

1. Poor city dwellers: Because no plans, sanitary codes, or building regulations controlled the rampant growth of English cities, the poor lacked adequate housing and many were forced to live in dark, filthy, overcrowded slums under very unhealthy and unsafe conditions.