lulu wrote:Name 5 New World archeological discoveries that would not be a mere footnote and please state your reason for making those choices
Since you don't appear to trust my opinions, I'm not sure why you are interested. Here are some that already made a difference.
1) the correct dating of Olmec ruins. They were originally thought (and received their name) to be much later. The discovery of their true dates shook the foundations of how Mesoamerican religion and culture developed.
2) the discovery that the Maya (and pretty much everyone else) were fierce warriors frequently in battle altered the then prevalent understanding that the Maya were peaceful sky-gazers and a nation of priests who worshipped time. That concept had underlain all historical explanations at the time and led to the idea that Maya cities were ceremonial centers and not real cities. That has been turned upside down.
3) Maya language was all about time and the glyphs were symbolic, not phonetic. That idea delayed (and for a number of years because of one man) the breaking of the Maya code. That was revolutionary.
4) San Bartolo's murals and texts pushed Maya high civilization back to earlier than 200 BC when it was thought not to have developed until around AD 200-400. In particular, it demonstrated that there was a different Maya script in use, which is sufficiently different that very little can be read. Notions of the development of literacy were dramatically altered.
5) The discovery of El Mirador completely shook the foundations of developmental timeline (probably second only to the dating of the Olmec). No one believed that anything that large and developed should exist in the Preclassic.
All of those things made fundamental shifts in the way we understand Mesoamerican history. Finding some pre-contact horse bones would probably be as interesting as it was to find pre-contact grape seeds. Who knew? Interesting, but it doesn't change anything important.