What is the last step in making and using products?

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.

At the time of hitler's 1939 invasion of poland, the us had a policy of appeasement negotiation opposition neutrality

Match each model with its name and the name of the scientist who created it.