Political parties in the US have become weaker over time. They were disliked by the founders but grew in importance during the Jacksonian era. However, reforms introduced by progressives curtailed parties' power and influence. This weakened parties and made them less able to hold officeholders accountable. Additionally, the federal system and state laws regulating parties have decentralized power and further weakened them. Now, candidates are chosen through primaries rather than being selected by party leaders. While parties still provide labels and organizations, their ability to coordinate across branches of government has declined.