Over 152 million votes were cast, representing more than 64% turnout among those eligible to vote (https://en.wikipedia.org/wiki/2024_United_States_presidentia...).
The USA has about 342 million people, and over 18% of them are age 14 or younger (https://en.wikipedia.org/wiki/Demographics_of_the_United_Sta...) and at least some of them are 15-17 (citation needed). So clearly, doing some arithmetic, there are fewer than 304 million adults.
Not only was "half the country" not "disenfranchised", literally a majority of adults actually voted (and this is not even considering that not all adults were statutorily allowed to vote in the first place).
But also, Trump won the popular vote this time.