What causes i've got a huge tree right up against my house?

Suburban lot geometry, mostly. Postwar central Indiana subdivisions were planted with silver maple, pin oak, and later Callery pear on small lots — species that mature far larger than the space they were given — and additions, decks, and driveways were later built out toward them. The tree did not move; the expectations did. Foundation cracking near trees in this region traces far more often to shrink-swell in the glacial-till clay and to downspouts dumping at the wall than to root pressure; a tree can worsen a dry-season shrink but rarely originates the crack. Attributing a specific crack to a specific tree requires a structural engineer, not an arborist — UNVERIFIED for any individual property.