For the US, it was the Civil War (1861-1865).
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That the railroads connected towns to towns, overal connecting states to states, causing them to rely on each other.
I believe it was Scotland, but don't rely on my answer because I am not sure.
Railroads wanted to see farmers settled in the Great Plains because it would create a steady demand for transportation of agricultural goods. As farmers established their operations, they would rely on railroads to transport crops to markets, generating revenue for the rail companies. Additionally, the presence of farmers would lead to the development of local communities and settlements, further increasing passenger and freight traffic for the railroads. Overall, more farmers meant more business opportunities for the rail industry.
First and foremost, without the Nile there would be no Egypt, just desert. They rely on it as a source of water, transport etc.
Transport!
Electron transport chains
The large intestines, or colons to be specific, transport digested food molecules into the blood stream
Transport
The first railroad, the Stockton and Darlington Railway, established in 1825, was crucial because it marked the beginning of a new era in transportation, facilitating the movement of goods and people more efficiently than ever before. It spurred industrial growth by providing manufacturers access to broader markets and reducing costs associated with transport. Additionally, the success of railroads transformed societal structures, promoting urbanization and altering travel patterns, ultimately laying the groundwork for the modern transportation network we rely on today.
To be able to transport materials and forces along a land based route rather then have to rely on ships for transport.
A central government is only an office; the states are the nation.