Using Manipulate for ploting

General Usage
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I found my problem: I was inputing a column vector for x-axis. Inputing row vector using transpose gave me expected output. Following code worked:

T_US=transpose(US_data_T_confirmed[8:end])
using Plots 
using Interact
@manipulate for Days in 1:length(dates)
     plot(T_US[1:Days],US_data_new_cases[1:Days],m=:o)
     xlims!(T_US[1],T_US[end])
     ylabel!("New Confirmed Cases in Past Seven Days")
     title!("COVID-19 cases")
end