At that time, Several countries in Europe were involved in competition for supremacy in the western region. Spain, France, and Great Britain was one of the biggest contenders.
So, the Spanish government invested in series of explorations in order to find sources of resources that have high value in the global market (such as gold, spices, tea, silk, and porcelain). The Spanish empire set the conquest to South America because they believed this region possess high amount of Gold and spices.
It was the French who sold the Louisiana Territory to the United States. This sale was made under the direction of Napoleon's government in order to help France pay for their war materials.
I would use a combo of mustard gas grenades to get the enemy out (mustard gas is VERY lethal), mortars to destroy any bunkers or ammo storage, and gorilla tactics and snipers to take out the enemy.
Explanation:
I do a lot of WW1 and WW2 planning of how I would do battles-