Trading of goods. For example on the southwest coast of British Columbia the indigenous people had a trading network expanding a great deal inland and even more so southward and northward.
During the war, be it the World War I or World War II, there was very little resistance among the German people about waging war. This might have came as a surprise for the other countries, and they also thought that the Germans are all hardline nationalist, but that was not the prime reason. The Germans were living in terrible conditions. The was lot of poverty, the job opportunities were not the best, the economy in terrible condition, and socially the country was in a dire situation. The German politicians used this desperation of the people, so they easily managed to convince them that the war would solve their problems. The people didn't had much to lose, so they went into war without thinking a lot, and seeing their economy and country becoming stronger, it seemed justifiable.
Gatherers were the first to deliberately plant seeds.
