Which is most true of jim crow laws?

The Jim Crow laws were local and state laws enacted in the southern states of the United States that institutionalized racial segregation, affecting mostly African Americans, but also Asians, and other ethnic groups. They were effective between 1876 and 1965.

The most known Jim Crow laws required that public schools and most public places (including trains and buses) have separate facilities for whites and blacks.  

State sponsored school segregation was declared unconstitutional by the Supreme Court in 1954 in the Brown v. Board of Education. All other Jim Crow laws were repealed by the Civil Rights Act of 1964.

explanation:

an oligopoly is a term used to clarify the structure of a particular market, industry, or organization. a market is considered oligopolistic or amazingly focused when it is shared between a few companies.

a sample of water is taken and kept in a beaker in a freezer at a constant temperature of 0°c. if the system is at dynamic equilibrium, which of these statements is true?