His 1930 tariff was passed with the goal of protecting the american economy, but in reality it reduced u. s. imports and exports by as much as 50%.

The Hawley Smoot Tariff

Smoot-Hawley Tariff
Made the depression worse I think

The changes to agriculture in the united states since 1900 is that increased mechanization has increased food production, thereby increasing the need for labor. there has been an increased need for higher speeds of food production due the fact that the population in the united states continues to rise.