William Marbury most likely supported the Judiciary Act of 1789 because it allowed him to take his case directly to the Supreme Court. Specifically, Marbury sought a writ of mandamus from the Supreme Court under the authority of Section 13 of the Judiciary Act, which he believed gave the Court original jurisdiction to hear his case to compel James Madison to deliver his commission. This Act provided the legal basis for Marbury to bring his claim before the Supreme Court rather than a lower court.
The other options, such as overruling James Madison, confirming Marbury’s appointment, or limiting the Constitution’s power in his case, are not accurate as the Supreme Court actually held that Section 13 of the Act was unconstitutional for expanding the Court’s original jurisdiction beyond what the Constitution allowed. The case ultimately established judicial review, but Marbury himself most likely supported the Act because it gave him the procedural means to bring his claim to the Court.
