No.
Yes, there was a civil war in El Salvador. also their war congress places of death and fear to people who had war with El Salvador?
No. El Salvador has qualified for two FIFA World Cups (1970 and 1982). They finished at the bottom of their Group on both occasions.
No they have never won it.
of corse it has snowed! it snows in the winter and it has snowed in loads of places!