The most significant obstacle in building the transcontinental railroad was

Crossing the Sierra Nevada and the Rocky Mountains

Explanation:

The Transcontinental Railroad was a huge project that lasted from 1863 to 1869 and connected the US Rail network with the Pacific Coast Railroads. There were many obstacles but the most significant one was Sierra Nevada since it was very expensive to make the railroad pass through the mountains to reach the Great Basin. Later they discovered a way across the Sierras that would be suitable for the railroad.

the caste system in india is the paradigmatic ethnographic example of caste. it has origins in ancient india, and was transformed by various ruling elites in medieval, early-modern, and modern india, especially the mughal empire and the british raj.it is today the basis of educational and job reservations in india.it consists of two different concepts, varna and jati, which may be regarded as different levels of analysis of this system.

the caste system as it exists today is thought to be the result of developments during the collapse of the mughal era and the british colonial regime in india. the collapse of the mughal era saw the rise of powerful men who associated themselves with kings, priests and ascetics, affirming the regal and martial form of the caste ideal, and it also reshaped many apparently casteless social groups into differentiated caste communities.the british raj furthered this development, making rigid caste organisation a central mechanism of administration

i didn’t fully understand your question but i hope this you !

a overment ran by a signle strong leader is also known as multiple things depending on the country and the coutnrys belifs and relgions

president,dictator