WHY DIDN'T COUNTRIES WANT TO ACCEPT MIL WITH STAMPS FROM OTHER COUNTRIES?

Countries often hesitated to accept mail with stamps from other nations due to concerns over sovereignty, security, and the integrity of their postal systems. Accepting foreign stamps could complicate the collection of postage fees and create confusion about mail delivery standards. Additionally, there were fears about the potential for fraud and the difficulty of ensuring that international postal agreements were upheld. These factors contributed to a preference for domestic stamps to maintain control over postal operations.