The global television viewing figures for the Superbowl is on average about 10% of that of the World Cup Final. As a point of reference this should show how popular is American Football in comparison with a global sport like soccer.
AnswerAmerican football is popular in the USA and Canada. However a European league started during the 1990's but went bust in 2007.The superbowl is American football most important match, it is watched by between 98 and 150 million people mainly in the USA and Canada.
After many attempts to make American football an important global sport still the vast majority of viewers and players are in the USA and Canada.
However football [soccer in USA/Canada] has more participants in the USA than American football.
Making American football a minority sport in global terms behind Basketball, cricket, volleyball, Rugby union, futsal and football.
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According to www.coldhardfootballfacts.com:
"The length of the NFL game ball is 10 7/8 to 11 7/16 inches from tip to tip. The circumference is 27¾ to 28½ inches if you measure along the laces. The circumference is 20¾ to 21¼ around the fat side of the ball, measuring perpendicular to the laces." Or a jounior size ball is smaller.
It's a considerably and significantly big sport in America. In other countries; however, it is not so popular.
The total field is 120. Discluding the endzones it is 100 yards. Each endzone is 10 yards