Differences in moon sighting between countries and its effect on those who travel from one to another

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Why are the Muslims not united in their fasting?
They fasted then they went back to their homeland where Ramadaan had not yet begun

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Related Answers:
He was fasting then he traveled to another country where they started fasting later; should he fast thirty-one days?
It is not permissible to hold two Jumu‘ahs in one mosque
One may catch up with jumu’ah prayer by one rak’ah
Why are the Muslims not united in their fasting?
They fasted then they went back to their homeland where Ramadaan had not yet begun

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