Did the both the us and ussr have atomic weapons after 1949

Which of the following descriptions is an example of the curtual diffusion

Which statement about congress is accurate? it contains only the house of representatives. the senate’s membership is based on a state’s population. it is bicameral, according to the constitution. membership in both houses is based on equal representation.

After studying the timeline above, what observations can you make about u.s. environmental policy between 1970 and 1996?