Why is there a area 51

Area 51 is in lincolin county in sothern nevada. Area 51 is a large military airfield and its one of the most secretive places in the world. I found out that area 51 have many diffant names like the paradise ranch,water town strip and bream land. Studies say that the united states goverment keeps died aliens,clones them and reverse-engineers theeir spacecraft. Theu-2 spyplane.the mach3 blockbird,and the f-117 stealth were all developed.from all this info it gets me thinking if there some thing out there besides us but who knows. cory moser