trade routes

The game often fails to save trade routes from looting for a long time. I propose to divide the purchase of resources and trade routes. The purchase of the resource will be possible after the purchase of trade routes in certain territories. 

This allows you to: 

1. Create safer paths.

2. Do not stop the purchase of a resource if a trade route has been looted in one territory and there is an alternative route in neighboring territories.

 I think this is an interesting idea.