Name The Year: Tanganyika becomes independent within the British Commonwealth.?

Questions

the electric chair was first used in 1890, 1900 or 1910?

for what new england woman's college was the first brand of wrigley's gum named?

which was the first credit card?

what was the first safety feature patented for an automobile and attached to a front fender?

what was first opened in 1922 by national department stores in saint louis?