There were certainly people there before them just as there were people after. I find that viewing things on a larger scale than we live on helps us appreciate that the world does not belong or yield to us. It was there before we walked it and it will be here after were gone, so the flawed view that any one people has a right or claim is to me personally laughable. It was viewed similarly by those indigenous people you spoke of.

Countries don't stop bad actors and they don't protect the weak. They protect the interests of the ruling class and provide means of control. In this very situation it would appear that nothing is stopping the obliteration of Gaza. Boundaries, countries, walls and the like are just means to segregate and divide. It could be racially, economically, religiously. Whatever you like. As long as we keep propping up these institutions we will never get any closer to peace and unity on those human scales you're so concerned with.

Governance doesn't need to be tied to borders or countries just as hierarchies don't need to be organized vertically.

It was then the Romans and the Muslims that did the oppression and genocide.

When did the Muslim-world commit genocide against Jewish people? The medieval Muslim-world was a safe haven for Jewish communities - as opposed to Christendom... you know - the place where antisemitism originates from?

Your abolishment of boundaries and countries is also a very simplistic world view.

I'd say that fetishizing lines drawn on a map is a pretty simplistic thing in itself.

Without government, you can’t stop the strong from obliterating the weak.

So your solution is to allow the strong a government so that they can obliterate the weak even more easily?

Deuteronomy 20:16-18

16 However, in the cities of the nations the Lord your God is giving you as an inheritance, do not leave alive anything that breathes. 17 Completely destroy[a] them—the Hittites, Amorites, Canaanites, Perizzites, Hivites and Jebusites—as the Lord your God has commanded you. 18 Otherwise, they will teach you to follow all the detestable things they do in worshiping their gods, and you will sin against the Lord your God.

דְּבָרִים

טז רַק, מֵעָרֵי הָעַמִּים הָאֵלֶּה, אֲשֶׁר יְהוָה אֱלֹהֶיךָ, נֹתֵן לְךָ נַחֲלָה--לֹא תְחַיֶּה, כָּל-נְשָׁמָה יז כִּי-הַחֲרֵם תַּחֲרִימֵם, הַחִתִּי וְהָאֱמֹרִי הַכְּנַעֲנִי וְהַפְּרִזִּי, הַחִוִּי, וְהַיְבוּסִי--כַּאֲשֶׁר צִוְּךָ, יְהוָה אֱלֹהֶיךָ יח לְמַעַן, אֲשֶׁר לֹא-יְלַמְּדוּ אֶתְכֶם לַעֲשׂוֹת, כְּכֹל תּוֹעֲבֹתָם, אֲשֶׁר עָשׂוּ לֵאלֹהֵיהֶם; וַחֲטָאתֶם, לַיהוָה אֱלֹהֵיכֶם.