Caravan cities and ports required governments to fund a variety of infrastructural improvements, from roads and docks to storage facilities, to security along the routes in and out of town. why did governments choose to spend money on these kinds of things?

The reason behind constructing infrastructure along caravan port  and investing more money is to built more trade hubs.

Explanation:

The reason behind constructing infrastructure along caravan port  and investing more money is to built more trade hubs. The reason behind constructing this trade hub is to provide that area where trader can  transit their goods and services to the buyer.

The other important reason is that it become the center point for trading and  import and export of various goods to various part of the world.

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