The result of the plessy v. fergusson supreme court decision was that segregation laws were
a. now spread to northern states.
b. considered unconstitutional.
c. now banned in the south.
d. considered constitutional.

The result of the Plessy v. Fergusson Supreme Court decision was that segregation laws were considered constitutional.

Explanation:

The result of the Plessy v. Fergusson Supreme Court decision was that segregation laws were considered constitutional.

Plessy v. Ferguson, 163 U.S. 537 (1896), was an important decision of the U.S. Supreme Court that upheld the constitutionality of segregation laws for public institutions.

a. because the u.s. was the leading with the most technology, economy, etc. also was teamed with other allies witch boosted the economy and materials to improve technology and use it.