Before world war ii, alcoa controlled the supply of bauxite in the united states. because bauxite is a scarce resource that is vital to the production of aluminum:

Bauxite is the Ore of Aluminum

Explanation:

An ORE is the naturally occurring form of a particular element, from which the element can be EXTRACTED and further purified for commercial or other uses.

So, Bauxite is the principal ORE of aluminium in NATURE. It is a clay-like mineral, being a mixture of hydrated oxides and hydroxides. An example is (Al(OH)3)

Thus, Alcoa controlled the supply of bauxite in the United States before the World War II IN ORDER TO ensure the continuous availability of aluminum

the man is bald so he has no hair to get wet

substitution is the answer in this case