What was the most significant obstacle in building the transcontinental railroad?

There were many obstacles for building the First Transcontinental Railroad, including the Native Americans who sometimes actively impeded railroad construction, the many buffalo that inhabited the west, and of course the physical obstacles such as the rivers and canyons that had to be crossed and mountains that had to .

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what is the tax base for the sales tax?

it should be (usually ) 6%

this statement is true.

forests are public goods, available for everybody. when usage of such a good becomes interesting for consumers and its usage increases, there can be a risk of overexploitation. it is a non rival good therefore, if one person consumes the good it does not reduce the availability for subsequent consumers.

these caracteristics require the establishment of measures in order to prevent the destruction of a commonly owned space, for example, to restrict the amount of people that have access to the same time.