As you don't know much about history...
So to keep it short and to the point, though many conspiracy theories abound, yet Freemasonry was very popular in colonial America and has continued to grow. Pretty much any male can be a Freemason, you do not have to be connected, sponsored or recommended by another member, and they have very simple requirements that most anyone can meet.
Members of Freemasonry reads like a huge list of significant and often famous figures in United States history up to today, pioneers/frontiersmen, Presidents, Vice-Presidents, Senators, Congressmen, Supreme Court Justices and others of the political and legal professions, Military leaders, Corporate & Business leaders, leaders of science, the arts and music, famous inventors, athletes, astronauts, different races including Native American and African American, and leaders/scholars in various faiths such as Baptist, Christian Scientist, Presbyterian, Methodist, Episcopalian, Lutheran, and even Catholic.
Yet, much is made, primarily by 'religious intolerants', of supposed similarities between certain religious rites of Mormons and the ceremonies of Freemasonry (not a religion - their view). Conveniently overlooked is the fact that such similarities exist in many other institutions also. Freemasonry, as the oldest (by it’s claims) fraternity in the world, certainly had its ceremonies and forms copied either consciously or unconsciously throughout the past 3 or 4 centuries. Likewise, its [Freemason] forms and ceremonies did not arrive 'fully-formed' and have elements from institutions, beliefs, and societies well before their own existence. Whether any of this 'proves' that Joseph Smith was not a Prophet or that Mormonism is a false religion is specious at best.
A very, very short list of well-known, American, Masonic members: John Hancock - the first signer of the Declaration of Independence, and President of the Continental Congress, Patrick Henry - American colonial patriot, President George Washington, Benjamin Franklin - During his stay in France, he became Master of the Lodge Les Neuf Sœurs in 1779, President Andrew Jackson, both Lewis and Clark, Daniel Boone, James Bowie, David Crockett, “Buffalo Bill”, “Kit” Carson, all American frontiersmen/pioneers...
That small list is hardly scratching the surface. And don’t forget Joseph Smith. He was a very intelligent man, maybe he too had a good reason for wanting to be a member...
If you want to know more...
www.lds.org
and/or
www.mormon.org
If you really want to know more...