Why is "Poland in the Early Middle Ages" trending?

Wikipedia Overview

The most important phenomenon that took place within the lands of Poland in the Early Middle Ages, as well as other parts of Central Europe was the arrival and permanent settlement of the West Slavic or Lechitic peoples. The Slavic migrations to the area of contemporary Poland started in the second half of the 5th century AD, about a half century after these territories were vacated by Germanic tribes fleeing from the Huns. The first waves of the incoming Slavs settled the vicinity of the upper Vistula River and elsewhere in the lands of present southeastern Poland and southern Masovia. Coming from the east, from the upper and middle regions of the Dnieper River, the immigrants would have had come primarily from the western branch of the early Slavs known as Sclaveni, and since their arrival are classified as West Slavs and Lechites, who are the closest ancestors of Poles.[a]