Conversation so far:
who made martin luther king day a federal holiday
President Ronald Reagan signed the Martin Luther King Jr. Day holiday into law in 1983, and it was first observed three years later.
why was martin luther king day first observed three years later
Although Martin Luther King Day was signed into law, it took effect three years later. Not every U.S. state chose to observe the holiday at the state level until 1991.
what day does martin luther king day fall on
Martin Luther King Jr. Day is observed on the third Monday of January each year.
how was stevie wonder involved with martin luther king day
Stevie Wonder released Happy Birthday to popularize the campaign to make Martin Luther King Jr's birthday a holiday in 1980 and hosted the Rally for Peace Press Conference in 1981.

Question: how many signatures were collected for the petition
Self-contained rewrite: how many signatures were collected to petition congress to make martin luther king jr.'s birthday a holiday