There is ample natural fresh water available in most places.
There are more problems with drought in areas such as the American Southwest, Australia, and North Africa. The technology for these plants is becoming cheaper to build.
Yes, wolves still are found in North America but are pretty much limited to the north.
flowers
it is hard to know but almost all plants
The plant that was domesticate in North America is corn which also was domesticated in South America
north America
All plants to a certain degree contain salt. This is because salt is everywhere in any given environment in North America.
North America
French colonists rarely established large plantations in North America
Switchgrass is one kind of plant.
the oceans
Columbus' personal impact on North America was zero: his discoveries were limited to Central and South America. The European's later impact on North America was of course massive through immigration, colonization, industrialization and many other things.