Immigration restrictions of the 1920s were introduced as a result of

bloodiest single day of war   |   gettysburg

where the civil war ends for good   | appomattox court house

the first major land battle; south wins | bull run/manassas (va)

gives union control of the mississippi river |   vicksburg

lee’s first tactical defeat; big win for union |   fort sumter1

with lincoln's re-election |   atlanta

south wins

splits confederacy in two for the duration of the war,

antietam

i'm pretty sure it would be, the mediterranean sea.

i believe the answer is the last option, the magyars preferred to invade by land.

i hope this ! : )