For example, according to the Henley Passport Index the weakest passport is from Afghanistan (not a surprise) as cizitens there can only visit 24 destinations visa free meaning they require a visa just to travel anywhere while for instance a Japanese passport holder can visit up to 187 destinations visa free making their passport strong.

Why is it that passport holders from “third world” (i.e. Syria, Iraq, Pakistan, Somalia, etc.). nations are weak, meaning they need to constantly apply for visas just to visit countries that citizens of “first world” countries can enter without a visa. (Like an American can enter Poland without a visa while a Iranian needs a visa before entering).

As in if they saw someone from a “third world” country via immigration, they either get profiled more or face discrimination at border crossings due to suspicion of overstaying or violating the terms of their visa (i.e. entering under a tourist visa but finds employment), is that why it’s difficult for immigrants from those countries to travel?

What determines passport strength? Does it relate to a nation’s diplomatic relations and political stability? Since people from the “first world” can travel to a lot more destinations (is it more on mutual trust? That nations have biases towards certain regions of the world & their reputation, like they consider Middle East as an unstable region).