Short answers, pulled from the story.
The 1970 NFL season was the first after the consummation of the AFL-NFL merger, making it the 51st regular season under a fully unified 26-team league. The ten former AFL clubs joined three former NFL teams to form the new American Football Conference, while the remaining thirteen NFL clubs formed the National Football Conference.
The NFC realignment was so contentious that five plans were considered. The final plan was selected on the 16th of January, 1970, when Commissioner Pete Rozelle's secretary, Thelma Elkjer, drew it from an envelope placed inside a vase. The Baltimore Colts, Cleveland Browns, and Pittsburgh Steelers agreed in May 1969 to join the AFL teams in the new AFC.
The Baltimore Colts defeated the Dallas Cowboys 16-13 in Super Bowl V on the 17th of January, 1971, at the Orange Bowl in Miami, Florida. It was the first Super Bowl played on artificial turf.
Monday Night Football debuted on ABC on the 21st of September, 1970. The first broadcast team consisted of play-by-play announcer Keith Jackson, sportscaster Howard Cosell, and former Dallas Cowboys quarterback Don Meredith. The NFL became the first professional sports league to air a regular prime-time national game series.
The Pittsburgh Steelers selected quarterback Terry Bradshaw from Louisiana Tech University with the first overall pick. The draft was held from the 27th to the 28th of January, 1970, at New York City's Belmont Plaza Hotel.
On the 8th of November, 1970, New Orleans Saints placekicker Tom Dempsey kicked a 63-yard field goal as time expired to defeat the Detroit Lions 19-17. The kick broke the previous record by seven yards and stood for 43 years.