Most of the strongest tornadoes on record (those rated F5 or EF5) have occured in Tornado Alley in the United States, particularly in Texas, Kansas, and Oklahoma. Though, a few such as the Xenia, Ohio F5 of 1974 occurred outside that region.
The fastest winds on record (302 mph +/- 20) were measured in the F5 that struck Moore, Oklahoma on May 3, 1999. However, direct wind measurements are rares, so other tornadoes may have been stronger.
Most likely yes. Tornadoes have occurred in Brazil.
There were 94 tornadoes in Alabama in 2008.
There were 105 tornadoes in Iowa in 2008.
There were 20 tornadoes in Ohio in 2014.
15 tornadoes occurred in Michigan in 2011.
There were 1,103 tornadoes in the U.S. in 2006.
There were 16 confirmed tornadoes in Arkansas in 2007.
If you mean the state of Massachusetts, then yes. Tornadoes have occurred, and killed, in Massachusetts.
There were 1,817 tornadoes recorded in the U.S. in 2004.
The U.S. had 1075 confirmed tornadoes in 2000.
65 tornadoes occurred in North Carolina in 2011.
There were 1374 tornadoes confirmed in the United States in 2003.