Were the stars of the 19th century, and their music generated most of the sheet music sales in the united states.

According to the statement above: "were the stars of the 19th century, and their music generated most of the sheet music sales in the United States."

The stars of the 19th century were Opera singers.

establish villages

explanation:

crop rotation kepy different plants in the soil instead of once constintly. when switching out plants you have different nutrients being absorbed at different speeds and different roots growing differently therfore the spoil and water flow have to adapt and carry fresh nutrients to carry the constant changes that were going on in the soil.