As secretary of the treasury, what was alexander hamilton's main job?

His job was to deal with the country's financial management.

Explanation:

The National Treasury, Public Treasury or Public Treasury represents all the financial resources available to a State. It also designates the administration services responsible for the management of these resources, which in most countries is a state service linked to governmental portfolios dealing with economic affairs.

Connected to the national treasury is the treasury secretary, who has the functions of dealing with financial administration and federal accounting, as well as carrying out activities related to the issuance and implementation of operations involving the country's public debt securities. It is also responsible for collecting taxes and contributions to the Internal Revenue Service, as well as collecting any other resources that may enter into the "National Account of the National Treasury"