Final answer:
Jacob Lawrence's use of tempera painting allowed him to create a uniform color palette and produce his series of paintings at a quicker pace, enabling him to effectively portray the Great Migration through a series of sixty panels with consistent coloring and thematic unity.
Step-by-step explanation:
Tempera painting allowed Jacob Lawrence to create a large number of paintings for his series quickly using a consistent color palette throughout the work. Lawrence's method included laying out all the panels and then applying one color to all of them before moving on to the next, thereby maintaining uniformity and speed in production. His use of casein tempera also meant that the drying times were quicker compared to oil paint, facilitating a faster process. Additionally, Lawrence's style, which drew on synthetic Cubism, incorporated geometric forms and abstracted figures, and his strategic use of color brought visual unity across the panels depicting the Great Migration.