Migrants use rafts to cross Suchiate river to Mexico as bridge remains blocked

What is the primary focus of the introduction in the video?

• A detailed explanation of the main topic

• A brief greeting and overview

• An in-depth analysis of the second point

• A summary of the entire video

What does the second section of the video briefly mention?

• The conclusion of the video

• A summary of the introduction

• The first point in detail

• The second point or topic