music: 70's Chart Toppers: Name The Artist: Every 1's A Winner?

Questions

In 1492 Christopher ---------- learns of maize (corn) from the Indians of Cuba. ?

In 1605 Gunpowder Plot; ---------- try to blow up English Parliament. Plot uncovered & leader Guy Fawkes hanged. ?

In 1811 El Salvador's 1st battle against ---------- for independence. ?

In 1838 ---------- declares independence of Central American Federation. ?

In 1911 Italy attacks---------- , takes Tipoli & Cyrenaica. ?