How did american industrial leaders accumulate wealth during the late 1800s?

By creating monopolies and establishing trusts.

Explanation:

By the late nineteenth century, trusts and monopolies had taken over the American economy. This meant consumers were obliged to face high prices for everyday products, and a reform of regulations in the industry began to be demanded.

A trusts is an organization of many businesses within the same business that by combining forces, gain control over production and distribution of certain good, in order to limit competition.

Monopolies are companies that hold total power over an area of the economy, and can, therefore, set any price.

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