Major Texas settlements were connected by . a.
large overland bridges
b.
railroads
c.
stagecoaches and steamboats
d.
covered wagon trails

D

Explanation:

The Oregon Trail was a 2,170-mile (3,490 km) east-west, large-wheeled wagon route and emigrant trail in the United States that connected the Missouri River to valleys in Oregon. The eastern part of the Oregon Trail spanned part of what is now the state of Kansas and nearly all of what are now the states of Nebraska and Wyoming. The western half of the trail spanned most of the current states of Idaho and Oregon.

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