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In the beginning of The Last Jedi, the Resistance evacuated from their base on D'Qar, just before it was annihilated by the First Order. Then, throughout the movie, they tried to run away from the enemy ships and find a new base for themselves, in order to call for assistance.

Leia Organa: We need to find a new base.

Larma D'Acy: One with enough power to get a distress signal to our allies scattered in the Outer Rim.

In the end, the remaining Resistance survivors landed on the planet Crait and were able to send out a distress call, though there was no answer from anyone.

Kaydel Connix: Our distress signal's been received at multiple points, but no response.

Larma D'Acy: They've heard us, but no one's coming.

Was the signal actually heard by the allies? Why didn't they answer? Were they already controlled by the First Order, like the opening crawl stated:

Having decimated the peaceful Republic, Supreme Leader Snoke now deploys his merciless legions to seize military control of the galaxy.

closed as primarily opinion-based by Skooba, Blackwood, Valorum, Shreedhar, TheLethalCarrot Mar 30 '18 at 12:41

Many good questions generate some degree of opinion based on expert experience, but answers to this question will tend to be almost entirely based on opinions, rather than facts, references, or specific expertise. If this question can be reworded to fit the rules in the help center, please edit the question.

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    Voting to close per our future-works policy. Episode IX will likely explain this. – Skooba Mar 30 '18 at 12:00
  • Do you know there's nothing about this in the novelization or other media? – Essen Mar 30 '18 at 12:10
  • If there is I will gladly retract my close vote and comments. I did also give the question an up-vote, because it is a good question. – Skooba Mar 30 '18 at 12:12
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    Because they don't want to get killed fighting a hopeless cause? – Valorum Mar 30 '18 at 12:20
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    Lucas no longer has any say over stories or if/when they get told. – phantom42 Mar 30 '18 at 12:48