Learn Portuguese (Portugal): Vou emigrar, tanto mais que o desemprego aqui é enorme. - I am going to emigrate, especially since unemployment here is huge.

Tanto mais que translates to 'especially since' or 'all the more because'. It is a causal-additive connector, meaning it introduces an extra, reinforcing reason for the action (emigrating). Because it presents a factual cause rather than a doubt or hypothetical scenario, it triggers the indicative mood (é) instead of the subjunctive.

Could I just say especialmente porque instead of tanto mais que?

Yes, especialmente porque means almost exactly the same thing and is grammatically correct here. However, tanto mais que is a highly natural B2-level phrase that emphasizes how the extra information (huge unemployment) compounds the situation and seals the decision to leave.

Why use é (from ser) for unemployment instead of está (from estar)? Isn't unemployment a temporary state?

While economies fluctuate, using the permanent verb ser implies that the speaker views the high unemployment as a structural, long-lasting reality of the country rather than a temporary dip in the job market. This sense of permanence justifies their drastic decision to emigrate.

Why use Vou emigrar instead of the simple future tense Emigrarei?