Short Answer 
The 2018 midterm elections resulted in significant Democratic gains, with the party taking control of the House of Representatives due to voter dissatisfaction with the Trump administration. Despite this, Republicans maintained control of the Senate, while Democrats gained ground in gubernatorial races, reflecting a notable shift in political sentiment.
Step 1: Understand the 2018 Midterm Elections Outcomes
The 2018 midterm elections were crucial in altering the political dynamics in the United States. The Democratic Party achieved a significant victory by gaining control of the House of Representatives. This shift not only reflected the voters’ sentiments but also marked a response to the incumbent administration’s policies and actions.
Step 2: Recognize the Voter Sentiment and Backlash
This election cycle showcased a notable midterm backlash against the sitting president and his party. Many voters expressed their dissatisfaction with the Trump administration, leading to a wave of support for Democratic candidates. This change in support was fueled by various issues, including healthcare, immigration, and economic factors affecting everyday lives.
Step 3: Clarify the Control of Senate and Gubernatorial Elections
While Democrats made significant gains in the House, the Republican Party successfully retained control of the Senate. It’s also essential to note that Democrats did not lose seven gubernatorial elections; instead, they gained several states, further solidifying their influence. Additionally, during this period, Trump’s approval ratings fell, indicating increased dissatisfaction among the electorate.