Not only that, but there was trade and migrations across the Bering straight before Columbus too, as evidenced by the spread of the Yupik people/Paleo-Eskimos.
Indonesia (Makassar) also traded with aboriginal Australians but this started in earnest in the 1700s. Still, it’s reasonable to conclude the entire earth was tenuously connected (technologically and historically if not actively) already even in the 1400s aside from some very isolated islands.
Yeah, I think the Siberia-Alaska oversea connection had been established by then as well. So had the Kilwa Sultanate (connecting much of Africa).
But I think to claim the whole world, except islands, was connected we’d have to include Australia too. And before the 17/1800s there isn’t a lot of evidence of contact between Australia and Indonesia. According to this article, maybe contact started around 1500 or so: https://amp.abc.net.au/article/9320452. Though in the same article they mention some 1000 year old Kilwan coins found off the coast of Australia so you may actually be right that we were fully connected even in 1000!
Indonesia (Makassar) also traded with aboriginal Australians but this started in earnest in the 1700s. Still, it’s reasonable to conclude the entire earth was tenuously connected (technologically and historically if not actively) already even in the 1400s aside from some very isolated islands.