global unification is a gradual process that requires generations of leaders, generations of actions, generations of debates. generations of trying to convince some of arabian monarchies, a few years of doing regime change, a quadrillon dollars of global wide economic incentives and social welfare, and rewriting regulations and laws, might probably takes 2 centuries in theory
but as of the current world.... there are corrupt politicians from all nations, the incompetent, mainstream media, radicalists (all sides), poverty, radicalist activists (this is just terrorism), lack of accountability, corporations, and 2 or 3 known oppressive regimes from the same continent, i live in that same continent and i'm scared of the red regime
it's only around 75 years since ww2 ended, and probably around 30 years since the cold war ended, and around 70 years since our favorite China was taken over by a more unfavorable kind of China, so it's kinda expected that this century, and future centuries, are gonna experience a wild ride
if you'd want some of my opinions:
those who believe socialism would change anything is probably gonna need to study how to run a government and industry, i think we need something flexible, central, and pragmatic if we are gonna need a global-scale system, we'd need a combination of good practice of generating capital, providing social welfare, maintaining order, ensuring equity, plus good leaders and good politicians, and a degree of accountability and fairness... i think i'm just advocating for centralism and good governance