I believe the answer is: Sheet metal
Self tapping screws are made by creating a gap in the connector within the thread of a crew, which creates a flute and cutting edge just like what we see on tap. This makes self tapping screws able to tap their own hole in a sheet metal while normal screws can't.
The Bible I believe or it was Marco polo’s traveling to china please put both
Answer:
Railroads
Explanation:
Unlike airplanes and other forms of road transportation that their routes can be altered, have shortcuts, and other routes, railroads are fixed to the ground during construction and hence cannot be altered, hence they operate on fixed routes. Also railroads operate on fixed schedules, except for cases of delays, which seldom happens.
Answer:
Territories obtained in the Mexican American War of 1848 caused further sectional strife over the expansion of slavery in the ante bellum period. ... The ideological seeds of the American Civil War, in turn, were sown during that conflict.
Explanation:
