What problems did the US face during its early days?

Dysentery, Scurvy from the trip and food in general. It's why the Galapagos became a pit stop for awhile and they'd roll Tortoises onto the ship as rations later, It apparently tasted good but being a time where everyone was malnourished, the bar was pretty low. Giant tortoise was a part of sea fare. and now their endangered.

Explanation:

china has confucianism thats everywhere in asia but it isn't really a religion.