Help me out - trade ships, allegiance, broadcast centers

...through worm-holes?

Can trade ships traverse worm-holes?  If so, are there prerequisites?

I started a single-player game on a map where each solar system is connected only by wormholes.  In my second solar system, my colonies all have low allegiance.

1)  How do I effectively use broadcast centers?

2)  Does this culture spread across worm-holes?

3)  Is there a better way to keep allegiance up?
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Can trade ships traverse worm-holes? If so, are there prerequisites?
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Yes. Just the wormhole travel tech and previously explored where the wormhole goes.

1. Build them. They automatically produce culture which boosts allegiance. (Thus income as well) Also, culture upgrades give you a race specific bonus.

2. No.

3. No. (Well, destroying enemy culture centers will prevent them from damaging your allegiance.) Advent does get a late game tech to boost max allegiance, though.