Reddit reviews Empire

> he's not attempting to indoctrinate myself with his own beliefs through his writing.

He is now. Check out Empire.

> Right-wing rhetoric trumps the logic of story and character in this near-future political thriller about a red-state vs. blue-state American civil war, an implausibly plotted departure from Card's bestselling science fiction (Ender's Game, etc.). When the president and vice-president are killed by domestic terrorists (of unknown political identity), a radical leftist army calling itself the Progressive Restoration takes over New York City and declares itself the rightful government of the United States. Other blue states officially recognize the legitimacy of the group, thus starting a second civil war. Card's heroic red-state protagonists, Maj. Reuben "Rube" Malek and Capt. Bartholomew "Cole" Coleman, draw on their Special Ops training to take down the extremist leftists and restore peace to the nation. The action is overshadowed by the novel's polemical message, which Card tops off with an afterword decrying his own politically-motivated exclusion from various conventions and campuses, the "national media elite" and the divisive excesses of both the right and the left.

This isn't exactly an "invasion" and there are speculative military technologies involved, but Empire by Orson Scott Card is about a second US civil war. The enemy army mainly uses ground attacks.

Not necessarily. You're assuming both sides have nuclear weapons. You're also assuming the US government is willing to unleash nuclear weapons on their own cities.

Orson Scott Card already wrote a book about this, called Empire

Remind me of the Orson Scott Card novel about about an American coup. Main character dies halfway through, rather unsuspectingly, only to be replaced by a green recruit. It's called Empire and its really difficult to get through.

Not a sequel but the book that runs parallel.

Not a sequel per se, but the book that Shadow Complex dovetails into, so sort of a sequel.