Egypt and The Americas

Consider these similarities:

*Both have huge pyramids aligned to the cardinal points.

*Both have temples with megalithic stones,with extremely fine joints of less than a fiftieth of an inch.

*Both Egypt and the Americas used royal headresses of similar style.

*Both employed a unique style of construction using "L" shaped corners.

*Both use the same style of metal clamps to hold the huge stones in place.

*And both cultures used the process of mummification to preserve and honor their dead.

These compelling similarities suggest to some that both ancient cultures were influenced by a sophisticated common source. Was that source Atlantis?