As distant relatives of the Senju Clan, the Uzumaki Clan enjoyed exceptionally long lives, and their unique chakra properties often manifested as a talent for Sealing Jutsu. In that field, no one in the entire shinobi world could B the Uzumaki Clan. However, that did not mean the Uzumaki Clan was particularly powerful.
Because ninja kept their secret techniques closely guarded, ninja clans generally passed down only a single system of techniques. The Uchiha Clan, for example, focused on Fire Release and possessed almost no other elemental techniques. The Uzumaki Clan was much the same. Their Sealing Jutsu was unrivaled in the shinobi world, but they lacked the offensive abilities they needed. As useful as Sealing Jutsu was, it could not replace everything.
Another factor was their population. Because members of the Uzumaki Clan lived so long and possessed such tenacious vitality that they rarely died, they felt little urgency about continuing their family lines. They generally stopped having children after the first, unless that child died young and the parents were still young themselves. At the same time, the Land of Whirlpools was a small country and naturally could not accommodate too many people. They disliked conflict and did not expand their territory. All these factors left the Uzumaki Clan with little incentive to increase their numbers.
Besides, not every member of the Uzumaki Clan wanted to become a ninja. As the main population of an entire country, most of the clan consisted of nobles and commoners. These were the reasons the Uzumaki Clan could not become a ninja clan renowned on the same level as the Senju and Uchiha Clans.
In this shinobi war, the Land of Whirlpools was a natural ally of the Land of Fire because of its kinship with the Senju Clan. When Kirigakure Ninja