I believe it was 1862 when the transcontinental railroad became part of the Pacific Railroad Act. Right??
The period between the end of the middle ages and the present
(apex)
Answer:
The answer is agriculture and mining.
Explanation:
Agriculture. Agriculture became the dominant industry of the American Great Plains and Canadian Prairies during the second half of the nineteenth century and the early decades of the twentieth century. Farming operations had, of course, been carried on in some parts of the Plains for many years.
Hope that helped.
On beaches. beaches have sand and other rocks that make up conglomerate :).
