The expansion of the railroad directly led to economic growth in the us because

Railroads made resources and products easier to transport.

Explanation:

The expansion of the railroad led to economic growth in the United States, as the railroad facilitated the movement of resources and products. This meant that products became cheaper and more easily available. It also meant that markets that had previously been out of reach became available to businesses, allowing them to sell more products, and in turn leading to economic growth.

the word that best sums up the tone of the newspaper regarding the treaty of versailles is resentful.