In what year did the Dallas Cowboys play their first season?

Which NFL team's mascot is named Rampage? In which city is the home stadium of the San Francisco 49ers located? Which NFL team's mascot is named Sourdough Sam? In which division do the Seattle Seahawks play? In what year did the Minnesota Vikings play their first season? In what year did the Atlanta Falcons play their first season? In what year did the Miami Dolphins play their first season? In what year did the New Orleans Saints play their first season?