technically all 50 do not
since even the lines that look straight on maps actually follow the curvature of the earth
but to answer the question you probably meant
only Hawaii
tho even Hawaii has straight looking lines in the borders of its counties
so again
technically all don't & none do
Which two states have four straight lines as borders
because they want to
Colorado and Wyoming are the two US states with borders made up of 4 straight lines.
Utah, Colorado, and Wyoming
Colorado, New Mexico, Utah and Wyoming are the only ones I can think of.
Four states in the United States have straight line borders: Colorado, Wyoming, Utah, and New Mexico. These straight line borders were established through surveying techniques rather than natural geographical features.
Borders are determined either by natural formations such a s river or lake or by surveying which frequently is linked with longitude and latitude. The latter would be straight lines either N & S or E & W.
Hawaii
Hawaii and New Jersey
Many states in the Western US had their borders made along lines of latitude and longitude resulting in straight borders. This was done because the areas that became states were sparsely populated and often not entirely explored. So that a costly exploration and mapping of the borderlands to find a suitable boundary could be avoided, the people in charge of the states simply marked borders along lines they knew the existence of.
There are two states that have four straight lines as boundaries. These include the states Colorado, as well as Wyoming.
1 ( HAWAII )