Mother’s Day

Question 1: In which year was Mother's Day first officially celebrated in the United States?
Question 2: Which ancient Greek goddess, known as the mother of the gods, was celebrated in a spring festival that some historians consider to be an early precursor to Mother's Day?
Question 3: What is the name of the woman who is credited with founding Mother's Day in the United States?
Question 4: In the United States, what is the most popular flower given as a gift on Mother's Day?
Question 5: Which country celebrates Mother's Day on the second Sunday of May, similar to the United States, but also celebrates Mothering Sunday on the fourth Sunday of Lent?