Which explorer sailed for both the netherlands and england in search of the northwest passage

In the mid-1800s, native americans who had lived in the westtraded their manufactured goods with settlers. were able to resist diseases carried by settlers. offered their services as guides to settlers. prevented settlers from moving onto their territory.

The low and midlevel clouds that look like cotton balls are

How does the existence of a site like catus hill demonstrate the challenge that archaeologist face when making theories?