Final answer:
The postal service in the 17th-18th centuries was instrumental in communication and trade, with postal stations along trade routes and advancements in transportation improving efficiency. The introduction of telegraphs in the 19th century further revolutionized communication.
Step-by-step explanation:
The postal service between the 17th and 18th centuries played a crucial role in facilitating communication and trade. Postal stations were established approximately every 20 miles along major trade routes, providing supplies and lodging for travelers. In Europe, the advent of telegraphs in the 19th century greatly improved communication efficiency, reducing message delivery time from years to days. Additionally, advancements in transportation such as paved roads and canals further enhanced the postal service's reach and effectiveness.