Fact check: Which Massachusetts congressional districts have seen the most significant boundary changes since 2020?

1. Summary of the results

Based on the analyses provided, none of the sources directly answer which Massachusetts congressional districts have seen the most significant boundary changes since 2020. However, several key facts emerge:

Massachusetts underwent redistricting after the 2020 census, with new congressional and state legislative district maps enacted in 2021 ^{[1] [2]}. The analyses confirm that the state's congressional districts were redrawn following the 2020 census ^[2], but the sources fail to identify specific districts with the most significant changes.

One notable historical context provided is that the most drastic change in Massachusetts congressional districts occurred after the 2010 census when the state lost its 10th district ^[2], reducing the total number of congressional seats from 10 to 9.

2. Missing context/alternative viewpoints

The analyses reveal several important pieces of context missing from addressing the original question:

• Political controversy surrounding the redistricting process: There are allegations that Democrats have gerrymandered Massachusetts congressional districts ^[3]. The MassGOP Executive Director is quoted as calling the districts "terribly gerrymandered and unfair" ^[3].
• Broader national redistricting context: The Massachusetts redistricting occurred amid a larger national redistricting fight, particularly involving Texas, where Democratic legislators fled to Massachusetts during redistricting disputes ^{[2] [4] [3]}.
• Legal challenges: The redistricting cycle involved court challenges to maps in various states, including Massachusetts ^[5], though specific details about Massachusetts challenges are not provided.
• Voting power shifts: The new congressional maps shifted voting power within the state ^[6], but the analyses don't specify how or which districts were most affected.

3. Potential misinformation/bias in the original statement

The original question itself does not contain misinformation, as it simply asks for factual information about boundary changes. However, the question assumes that significant boundary changes occurred in Massachusetts congressional districts since 2020, which the available analyses cannot confirm or quantify.

The sources suggest that while redistricting did occur in 2021 following the 2020 census ^[2], none of the analyses provide the specific comparative data needed to determine which districts experienced the "most significant" changes. This gap in available information means the question cannot be properly answered based on the provided sources, despite multiple sources discussing Massachusetts redistricting in general terms.