All of the following allowed for widespread exploration starting in the 1400s except: better, more maneuverable ships navigation devices such as the compass, astrolabe, and better maps a spirit of discovery and innovation prompted by the renaissance fear of the unknown and desire to stay with tradition

Fear of the unknown and desire to stay with tradition was not a reason that allowed widespread exploration starting in the 1400s, as the explorers had no fear but a strong desire of discovering new places and getting richess.

Explanation:

The era of discoveries was a historical period that began at the beginning of the 15th century, extending until the beginning of the 17th century. During this time the Europeans, mainly Portuguese, Spanish and British, traveled almost the entire planet, mapping it and conquering it to a large extent. The reason for this expansion came from the need to access the riches of Asia with which to contribute to European mercantilism.

Many lands previously unknown to Europeans were discovered by them in this period, although most were already inhabited. From the perspective of many non-Europeans, the era of discoveries marked the arrival of invaders from previously unknown continents.

because the vietnam war was fought in an especially brutal and untraditional way