Why did Germany invade Norway

strategically, to secure ice-free harbors from which its naval forces could seek to control the North Atlantic;

to secure the availability of iron ore from mines in Sweden, going through Narvik;

to pre-empt a British and French invasion with the same purpose; and

to reinforce the propaganda of a "Germanic empire".

Explanation:

porter is writing economic history because he is focusing on the cost of developing vaccines.

increase in population