What was significant about the election of 1828? It was the first to include public conventions.
It the first under new voting reforms.
It reintroduced the two-party system.
It was decided by members of Congress.

The answer is "It reintroduce the two party system"

Explanation:

The 1828 US Presidential election was the eleventh quadrennial official political race. It was held from Friday, October 31 to Tuesday, December 2, 1828. It highlighted a re-match of the 1824 political race, as President John Quincy Adams of the Public Conservative Faction confronted Andrew Jackson of the Leftist alliance. The two players were new associations, and this was the primary official political race their chosen people challenged. Jackson's triumph over Adams denoted the beginning of Vote based strength in government legislative issues.

With the breakdown of the Federalist Gathering, four individuals from the Majority rule Conservative Faction, including Jackson and Adams, had looked for the administration in the 1824 political race. Jackson had won a majority (yet not dominant part) of both the discretionary vote and mainstream vote in the 1824 political decision, however had lost the unexpected political race that was held in the Place of Delegates.

In the repercussions of the political race, Jackson's allies blamed Adams and Henry Earth for having arrived at a "bad deal" in which Dirt assisted Adams with winning the unexpected political race as a trade-off for the situation of Secretary of State. After the 1824 political decision, Jackson's allies quickly started plans for a re-coordinate in 1828, and the Majority rule Conservative Faction broke into the Public Conservative Association and the Leftist alliance during Adams' administration.

answer; make a no-nonsense accusation of the other;

answer; expert witness;