What was a significant effect of Supreme Court
decisions under Chief Justice John Marshall
(1801–1835)?
(1) The powers of the federal government were
increased.
(2) The extension of slavery was limited.
(3) The president’s use of the veto power was
restricted.
(4) The states were given more control over
interstate commerce.
One of the most significant aspects of the Supreme Court decisions under Chief Justice John Marshall was that "(1) The powers of the federal government were increased" since this was a time of building and mounting power in the federal government.