Re: "Who got there first"
All of this conjecture is quite interesting, but is nothing new.
There is no shortage of archaeological anamolies worldwide.
However, Worlds In Collision, written by Jewish scholar Dr. Immanuel Velikovsky in 1950, provides evidence from every ancient peoples' written records and/or oral myths, which might indicate another plausible explanation as to why anthropological as well as geological artifacts from various ancient peoples and nations are found far from home home in places on our planet.
The theory that Egyptians, Hebrews, and Phoenicians sailed the world and settled the Americas thousands of years ago may be totally fallacious.
There is more than one way that cuneiform stone tablets, tools, jars, and yes; even entire boats, could find their way 6000 miles or more from their origins and to be buried deep in mud or sand, to be "discovered" and theorized over millenia later by academicians.
And...as I am always fond of telling various "Experts in their Field", who insist that only "such and such" could have...only "so and so" could have, I always say "After all is said and done, it always comes back to my famous Jewish Traveling Salesman Theory!--The theory that accounts for why imports and exports are found all over the world in unexplainable historic timelines!--Simply some old Jew in a canoe sailing around selling pots and pans and stone tablets."
A little humor:
When a university student, my earth science professor was offering the latest "proof" explanation of why the dinosaurs became extinct.
For at least 100 years, the very same academicians forced you to repeat verbatim the maxim that "climate change" killed off the cold-blooded reptilies.
Then, just recently, the "academic community" changed their party line to insisting all students repeat verbatim that "an asteroid hit earth and obliterated all life".
Then, adding insult to injury, some nitwit decided that "the dinosaurs weren't cold-blooded at all!...they were warm blooded just like us!".
Tired of being brainwashed with "the latest", I raised my hand and said "Professor, I am certain of what caused the dinosaur's sudden mysterious disappearance from earth."
"Go on"...she insisted.
"Well, ma'am, Aliens from Outer Space landed here, rounded all of them up just like cattle, herding them into gigantic ships, took them all to another planet in another world, and made Bar-B-Que out of them!"
"Why...That is one of the most ridiculous things I've ever heard!"...she said, a disgusted tone in her voice.
"No offense, Professor"..."but it makes every bit as much, if not more sense, than all of the other things I've been hearing "the experts" tell me!"