People in the US are able to freely travel between states, this isn't the case elsewhere in the world. Some things are crimes in some jurisdictions and not others, this is normal.
If you think it's inadequate, pass an amendment to the constitution, that's what the amendment process if for. If you think the process to too burdensome, encourage your state to secede.
Again, you ignore the actual realities of politics. Obama promised to codify Roe v Wade his first day in office. He then refused to, since it was better for democrats to keep it on as a political bargaining chip.
Now, what are US liberals supposed to do? Not vote and lose? Vote for the Republicans and see abortion criminalized federally? No, they have to vote for the Democrats again and maybe hope they finally try to pass their agenda. There is a false choice presented. It was urgent to the voters, but not to the politicians.
This is not a right that is specifically enumerated by the Constitution. The current Supreme Court has indicated that rights that are not specifically enumerated by the Constitution are subject to evaluation and curtailment.
Easier said than done, for many.
One really simple example of what the SCOTUS could do is they could rule that an unborn child - from the time of conception - is covered by the rights laid out in the 14th amendment.
Takes all choice back away from the state once more.
Do you know of countries with a federal government and where people can't travel freely between the member states? The ones I know don't have this problem so I'm not sure how that's something unique to the US.