same reasons northern europeans had to invent all sorts of fancy food preservation and complex power struggle societies revolving around crop limitations and war.

Meanwhile closer to the equator, much less progress was needed to live and let live.

In short, Americans are native tribes. we have plentiful IPV4 and couldnt care less about SLAAC or whatever other complex moon sun and seasonal tide gods, salted codfish and salt mining operations. we just dont need to care about long addresses, they're plentiful here.