Van effect of the steamboat’s popularity was that fewer people traveled by rail. steam locomotives became less popular. people began to build canals in the united states and europe. more people began to travel between the united states and europe.

A steamboat is a boat propelled by steam. In the 19th century, steamboat was widely used on rivers, especially on the Mississipi and its tributaries. Inicially they worked only on lakes and rivers, but later the steam was also applied to larger vessels that crossed oceans. The building of canals was very important for the economy in the United States, by reducing the prices of transportation of products from or to distant places.

Answer B. People began to build canals in the USA and Europe.

affirmative action refers to the policies that take gender, race, or ethnicity into account in order to promote equal opportunity.

employers subject to title vii are prohibited from taking race or sex into account in any employment decisions. aa is a penalty for having any job group substantially statistically "underutilized" in any race or either sex. the employer must take steps to eliminate the underutilization, then stop, ending its aa efforts

new evidence is discovered.

oversights and errors are corrected,

new technology is applied to evidence.