When a leader does such things they are trying to make the people proud of their nation. This is what Nationalism is.
Nationalism refers to the promotion of a nation's ideals to ensure that citizens are proud and loyal to their country. Nationalism is not a bad thing but can lead to ultra nationalism when people actively put others down for the interest of their nations. The leader in the above is instigating a very dangerous type of Nationalism by suggesting that the people are Superior to others but it is Nationalism regardless.
The first major domestic crisis of the US government under the Constitution resulted from the federal government exercising its new right to tax the states in order to bring in more revenue to pay down the war debt.
In agriculture you don't need to build factories to process and manufacture goods. The only benefit I would say is it became easier, but didn't change much.
