Sorry to say this but you are an idiot. The middle east is not 80% Arab. Those groups may speak the language but they are not Arabs but are instead arabized poenecians, assyrians etc. No the people were not that different too each other they all spoke the same language and were from the same country.
Goddamm man, you gonna come hard at someone like that, at least come with facts. Yes, the Middle East is 80% Arab by a broad definition of Arab.
If you really want to split hairs and claim that a lot of them are just "arabized", then by the exact same token most American colonists weren't ancestral English but were "anglicized".
Examples:
A bunch of Quakers we were talking about weren't English, they were Welch. The Welch people were descended from Celtic people of central Europe who didn't reach England until around 400 B.C. They might have learned English (just like most of the Middle East learned Arabic), but their mother tongue was Welch. William Penn had Welsh ancestry, and Thomas Jefferson not only had a Welsh background, but both read and spoke Welsh in addition to English and French.
The Scots-Irish were a weird mix. Many originated with Central European Celtic peoples who had ended up in Scotland instead of Wales, then later fled to Ireland and finally America. So they had originally spoken Scottish Gaelic but by the time they settled in America they spoke Irish Gaelic and referred to themselves as Irish. However, a lot of those Scot-Irish weren't even Scottish originally but were Calvinist religious refugees who had fled from Europe - the French Huguenots, the German Palatines, and the Dutch. Davy Crockett is a good example of a Scots-Irish whose actual background was French.
The Puritans and the Cavaliers were both descended from northern European (basically German) tribes who had invaded England in the 6th century - the Angles, the Saxons, and the Jutes. That's where the name "England", "AngleLand", comes from. But they were from completely different strata of society. The Puritans originated in the lower classes of British society and were seen as heretics, while the Cavaliers were from the nobility and were "good" Anglicans. So while they both spoke English, they had different accents, different religion, and different culture. The descendants of these Anglo-Saxon nobles in Virginia ended up being early presidents like Washington and Madison, while John Adams and especially John Quincy show more of their Puritan background.
But then you get into the issue that the Cavaliers, being royalty, didn't have huge numbers. So they imported slaves and indentured servants, mostly White at first but mostly Black in the end. The White indentured servants were mostly British from the lowest classes, but there were also large numbers of Germans and Irish among them.
And then, of course, you had the Germans and the Swedes who migrated in independently, mostly settling in Quaker lands around Pennsylvania and such. So many that there was debate about including German as an official language in early America. And all sorts of mixes of course - like Alexander Hamilton coming in from Nevis with a Scottish daddy and a French mama.
So you got people whose ancestors were from central Europe, northern Europe, and western Europe, whose ethic groups were Anglo-Saxon Brits, Welsh Celtic, Scots-Irish Celtic, French Huguenot, Dutch, German, or Swedish, who spoken English, Welsh, Irish, French, Dutch, German, and Swedish, who followed Anglicanism, Puritanism, Calvinism, or Quaker. And within a couple generations, they had incorporated French and Spanish Catholics too.
Yeah, you could say that they were "White" or that 80% of them "spoke English", but it wouldn't be any more descriptive than pointing out that Middle Easterners are Brown and 80% of them can indeed speak Arabic.
And yeah, I could do the same damn breakdown for the Middle East, easily (hell, I done wifed an Egyptian). If you know anything about its history, if you JUST take the Arabian peninsula, until Mohammed came along pretty much every tribe was at each other's throats, even though they were all the same color, spoke the same language, and most didn't have particularly meaningful differences in religion. Mohammad's influence was that the warring groups became fewer and bigger, but they still were at each others throats in a fight for power on the regular, and it had little to do with linguistic or religious issues. (In fact, the biggest religious split in Islam was caused BY a power struggle, not a difference of opinion on actual religious practice.)
Asking how the White Americans worked things out with each other and made a country work is a meaningful question. It wasn't because they were good people, as is abundantly clear. It wasn't because they had particularly similar backgrounds, that's a cheap answer that falls apart under the microscope. You gotta try harder.