Final answer:
The Inka developed the technique of irregular masonry using large stone blocks, which is exemplified by their earthquake-resistant constructions, such as Machu Picchu and the walls of Cusco. Their mastery in stonework is still visible today in the Wall of the Golden Enclosure in Cusco.
Step-by-step explanation:
The High Andean people who developed the technique of irregular masonry using large blocks were the Inka (Inca). The Inka excelled in the construction of elaborate structures such as Machu Picchu, which showcases their talent in shaping stone without mortar, known as ashlar masonry. Their technique not only created stunning architecture but also endowed their structures with earthquake resistance, which is one of the reasons why Inca architecture has survived in areas like Cuzco and Sacsayhuamán.
Significant structures that still stand today, such as the temple of Qorikancha in Cusco, demonstrate their skill. The lower walls of the temple, composed of perfectly fitted stone blocks without mortar, represent Inka architecture, while the European church of Santo Domingo built on top of it signifies the European construction methods and the conquest that followed.