The observance of Mother’s Day in the United States can be traced to the passage of a law. While a holiday honoring mothers had been celebrated by some individuals and organizations in the 1800s, it became official through the legal system. On May 8, 1914, the U.S. Congress enacted a law to designate the second Sunday as Mother’s Day, requesting a proclamation. The following day, President Woodrow Wilson issued the proclamation announcing the first national Mother’s Day as a day for Americans to display the flag in honor of those mothers whose sons lost their lives in war. Mother’s Day as a holiday received additional recognition later on as well, including the approval of a commemorative stamp by President Franklin D. Roosevelt in 1934, and votes from the U.S. House of Representatives in 2008 on a resolution honoring the holiday. For more details, visit the Wikipedia page on Mother’s Day in the United States.